Du Luping, Zhang Xuejin, Mei Ting, Yuan Xiaocong
Institute of Optoelectronic Materials and Technology, South China Normal University, Guangzhou 510631, China.
Opt Express. 2010 Feb 1;18(3):1959-65. doi: 10.1364/OE.18.001959.
A substrate with ease for fabrication is proposed for surface enhanced Raman spectroscopy (SERS). A two-dimensional dielectric grating covered by a thin silver film enables the excitation of both localized surface plasmons (LSPs) and surface plasmon polaritons (SPPs). The finite-difference time-domain simulation results show that the coupling between LSPs and SPPs is able to highly improve the Raman enhancement (2 x 10(9) as obtained by simulation). In addition, the near-field distribution at the top of cubic bumps along the transverse plane presents a highly regular hotspots pattern, which is required for an ideal SERS substrate.
本文提出了一种易于制造的用于表面增强拉曼光谱（SERS）的基底。覆盖有薄银膜的二维介质光栅能够激发局域表面等离子体（LSPs）和表面等离子体激元（SPPs）。时域有限差分模拟结果表明，LSPs和SPPs之间的耦合能够显著提高拉曼增强（模拟得到的增强倍数为2×10^9）。此外，沿横向平面在立方凸起顶部的近场分布呈现出高度规则的热点图案，这是理想SERS基底所需要的。
